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(No Model.)

W. P. WILSON. CHIMNEY TOP AND VENTILATOR.

N0. 320,608. Patented June 23, 1885.

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N PETERS. Mo-LMmIrlpMr. wmin m u c UNITED STATES PATENT OFFICE.

WILLIAM P. VVI'LSON, OF TBENTON, NEW JERSEY, ASSIGNOR OF ONE-HALF TO THOMAS CRAIG, OF SAME PLACE.

CHIMNEY TOP AND VENTILATOR.

SPECIFICATION forming part. of Letters Patent No. 320,608, dated June 23, 1885.

Application filed January 2, 1853. Renewed May 22, 1885. No model.)

T 0 all whom it may concern.-

Be it known-that l, WILLIAM P. WILsON, of Trenton, New Jersey, have invented anew and useful Improvement in Chimney Tops and Ventilators, of which the following is a specification.

My invention relates to improvements in chimney tops and ventilators in which, by means of appropriate mechanism, the natural forces of currents of air are utilized to produce an upward current of air entirely surrounding the upper end of the chimney top or ventilator, thereby creating at the immediate top of said chimney or ventilator a vacuum, which the air in the chimney 0r ventilator rushes upward to fill, thereby creating in said chimney or ventilator an upward draft. The mechanism by which I accomplish this is shown in the drawings hereto annexed, in which drawings similar letters of reference indicate the same parts.

Figure 1 is a general view of my apparatus, with a portion of the part Mcut away to show a wheel. Fig. 2 is a longitudinal sectional view thereof. Fig. 3 shows the spider. Fig. 4 shows an enlarged view of one of my wheels, with a section of a portion of the outer pipe and connected mechanism; and Fig. 5 is a sectional view of the pipes, mouth, and vane at the dotted line 1 2, Fig. 1.

In the drawings, Fig. 1, A represents the outer pipe, which I place over the top or ventilator. This pipe is provided with a vane, B, and on the opposite side with acircularopening having attached to it the funnel-shaped mouth 0. This pipe may be straight, lined throughout, although preferably I construct it with the enlargement D and subsequent contraction D. It is surmounted bya cap,E, raised some distance above the ends of the pipe by the supports E. I also provide this pipe with a flaring rim, F. This pipe extends some distance above the top of the chimney or ventilator, and is larger in diameter, thus allowing an annular space between the two. It revolves freely about the chimney or ventilator, and is supported by mechanism shown at H, Fig. 2.

Fig. 2 is a longitudinal sectional view of my apparatus. G is the top of the chimney or ventilator. In the top of this I place the spider H, of which an enlarged view is given in Fig. 3. The under bar of this spider being fastened to the chimney top or ventilator and the upper bar to the outer pipe, and the two pivoted together, it forms a pivot on which this outer pipe can freely revolve; or any other appropriate mechanism may be employed to pivot the outer pipe upon the inner.

To steady the lower part of the outer pipe, I attach to it short axles, on which Ihang four or more wheels, I. One of these wheels, enlarged, with a section of the pipe A and the connecting mechanism, is shown at Fig. 4, in which A represents a portion of the outer pipe; I, a wheel, and F a part of the flaring rim F. These wheels are rounded on the rim, and move freelyin a circular depression, K, in the roof plate L. Surrounding these wheels, and attached to the roof-plate L by a water-tight joint, is the collar M. In Fig. 1 this collar is shown partly cut away to show one of the wheels and its relative position. To this collar I attach by screws an annular collar, N, fitting about the pipe and preventing the wheels from rising, thus holding the outer pipe firmly on the top and steadily in position,while permit-ting it to revolve freely.

Over all I place the flaring collar F, for the purpose of excluding rain, dust, snow, or ice. This is connected firmly and by a watertight joint to the pipe A, and is disconnected with all the other parts.

Fig. 5 is a view of the pipe and other apparatus on the dotted line 1 2 in Fig. 1, showing the chimney-top G, the outer pipe, A, the

vane 13, the funnel-shaped mouth 0, and the annular space between the pipes.

The operation of my apparatus is as follows: The vane B keeps the mouth 0 always directed toward the wind. The air enters at the mouth and fills the annular space between the chimney or ventilator top and the outer pipe. The only way of escape for the air being from the top of this outer pipe, the air rushes upward in the direction indicated by the arrows in Fig. 2 and escapes at the top. This upward current produces a constant tendency toward a vacuum at the top of the chimney or ventilator, and thereby produces an upward current therein. I have shown the upper part of the outer pipe con- 5 out it.

tracted. Preferably I so construct them, as wheels I, in combination with the chimney or 10 it aids in creating a stronger draft in the chimventilator G, roof-plate L, collar M, and annuney; but this is not essential to my invenlar collar N, all substantially as shown and tion, as the upward draft is produced withdescribed.

'XVILLIAM 1?. WILSON.

Vhat I claim as my invention, and desire to secure by Letters Patent, is Vitnesses:

The outer pipe, A, provided with the vane JAMES BUCHANAN, B, month 0, flaring collar F, spider H, and CHARLES B. CASE. 

